Ⅰ. Depending on the composition of the glue, there are several glues used for construction plywood sheets:

Urea-formaldehyde glue: moisture proof glue used for interior decoration and furniture, not for outdoor use.

melamine glue: Moisture proof and has a certain degree of resistance to boiling, weather resistance can be used outdoors or indoors, but can not be often immersed in water.

Phenolic Glue: Moisture-proof, excellent boiling resistance, weather resistance can be used outdoors or indoors, can withstand outdoor wind and rain.

Ⅱ. According to the environmental protection level, the glue used for construction grade plywood can be divided into E0 grade, E1 glue, E2 glue (and unqualified glue that can't even reach E2 grade). E0 level is the highest environmental protection level. The plywood made of E1 glue can be directly used in indoors.

High-quality urea-formaldehyde glue/melamine glue/phenolic glue can reach E0 and E1 grades, that is, they can be used directly indoors.

Ⅲ. Environmental protection suggestions:

1. If you want to make wood products for general indoor use, you can use E1 (or even E0) urea-formaldehyde glue; if you want to make the wood products have stronger waterproof and moisture-proof performance, you can use E1 (or even E0) melamine glue.

2. If you want to make wood products for outdoor use, you can use E1 (or even E0) phenolic glue.